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n is equal to the number of 4s in all numbers <= n written in base 6.
0

%I #5 Mar 30 2012 17:28:13

%S 42768,44921,44922,44923,44924,44925,46656,89424,91577,91578,91579,

%T 91580,91581,93312,136080,138233,138234,138235,138236,138237,139968,

%U 182736,184889,184890,184891,184892,184893

%N n is equal to the number of 4s in all numbers <= n written in base 6.

%Y Cf. A014778.

%K nonn,base,fini,full

%O 1,1

%A _Olivier GĂ©rard_

%E List proved complete by _Hugo van der Sanden_ (cf. A014886).